Defensive publication



DEFENSIVE PUBLICATION UNITED STATES PATENT OFFICE Published at the request oi the applicant or owner in accordance with the Notice of Apr. 11, 1968, 849 O.G. 1221. Identiflcation is by serial number of the application and the heading indicates the number of pages oi. specification, including claims, and of sheets of drawing contained in the application as originally filed. The file of this application is available to the public for inspection; reproduction may be purchased for 30 cents per sheet.

Applications published under the Defensive Publication Program have not been examined as to the merits of alleged invention; The Patent Oflice makes no assertion as to the novelty of the disclosed subject matter.

PUBLISHED SEPTEMBER 30, 1969 785,025 HOT MELT ADHESIVE Gerald Dougherty, Wilmington, Lewis W. Hall, Jr., Claymont, and John A. Hedge, Wilmington, Del. (all Sun Oil Company, P.0. Box 426, Marcus Hook, Pa. 19061) Continuation of application Ser. No. 554,992, June 3,

1966. This application Dec. 9, 1968. Published Sept. 30, 1969 Int. Cl. C08f 37/16 U.S. Cl. 260--27 No Drawing. 15 Pages Specification This invention relates to hot melt adhesive compositions. In particular, it relates to hot melt adhesive compositions produced from low-cost materials and suitable for bonding a variety of materials together. More particularly, it relates to compositions comprising atactic propylene-ethylene copolymer and a suitable tackifier. The copolymer has a molecular Weight in the range between 80,000 and 225,000 and is predominantly polypropylene with small amounts of polyethylene in the range between .5 and 49 weight percent in the propylene polymer chain. Suitable tackifiers are rosin, hydrogenated rosin, disproportionated rosin, polymerized rosin, the esters of rosin, the esters of hydrogenated rosin, the esters of disproportionated rosin, the esters of polymerized rosin and terpene resin. 

